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Ashburtonite, Ashburton Downs, Pilbara Region, Australia ~4cm wide
*Ashburtonite Micro and rare species collections. Pb4Cu42+Si4HO12(HCO3)4(OH)9Cl Australia Western Australia, Capricorn Range, Ashburton Downs, Anticline Prospect, Mineral Claim 84. The claim is located 11.2 kilometers west-southwest of the Ashburton Downs homestead. “It occurs as clusters of clear blue, prismatic crystals up to 0.4 mm long. Associated minerals include diaboleite, duftite, beudantite, caledonite, plattnerite, cerussite, malachite and brochantite. The mineral has a vitreous luster and light blue streak. …Ashburtonite occurs as very small crystals, distinctly blue with no greenish tint, up to 400 μm long and 30 μm wide clustered in aggregates up to 20 mm in diameter…The specimens used in the present description were collected by Blair Gartrell. …Gartrell had noted several rare species and a number of unusual minerals that he could not identify. His astute observations have now resulted in the description of two new mineral species: gartrellite… named in his honor, and ashburtonite, described in the present paper. …The Anticline prospect…has an assemblage of secondary minerals…probably derived from a primary sulfide assemblage.”1 1. American Mineralogist, Vol. 76, p. 1701-2 2. Nickel, E.H. & Gartrell, B. J. (1993): Secondary Minerals from Ashburton Downs, Western Australia. Mineralogical Record 24: 203-216,218.